linux-kernel - Re: [PATCH 09/10] compiler-gcc.h: drop checks for older GCC versions

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Date:   Mon, 13 Sep 2021 09:26:38 -0700
From:   Kees Cook <keescook@...omium.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>,
        Nathan Chancellor <nathan@...nel.org>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Joe Perches <joe@...ches.com>, Arnd Bergmann <arnd@...nel.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 09/10] compiler-gcc.h: drop checks for older GCC versions

On Fri, Sep 10, 2021 at 04:40:46PM -0700, Nick Desaulniers wrote:
> Now that GCC 5.1 is the minimally supported default, drop the values we
> don't use.
> 
> Signed-off-by: Nick Desaulniers <ndesaulniers@...gle.com>
> ---
>  include/linux/compiler-gcc.h       | 4 +---
>  tools/include/linux/compiler-gcc.h | 4 +---
>  2 files changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
> index 3f7f6fa0e051..fd82ce169ce9 100644
> --- a/include/linux/compiler-gcc.h
> +++ b/include/linux/compiler-gcc.h
> @@ -98,10 +98,8 @@
>  
>  #if GCC_VERSION >= 70000
>  #define KASAN_ABI_VERSION 5
> -#elif GCC_VERSION >= 50000
> +#else
>  #define KASAN_ABI_VERSION 4
> -#elif GCC_VERSION >= 40902
> -#define KASAN_ABI_VERSION 3
>  #endif
>  
>  #if __has_attribute(__no_sanitize_address__)

Reviewed-by: Kees Cook <keescook@...omium.org>

> diff --git a/tools/include/linux/compiler-gcc.h b/tools/include/linux/compiler-gcc.h
> index a590a1dfafd9..43d9a46d36f0 100644
> --- a/tools/include/linux/compiler-gcc.h
> +++ b/tools/include/linux/compiler-gcc.h
> @@ -16,9 +16,7 @@
>  # define __fallthrough __attribute__ ((fallthrough))
>  #endif
>  
> -#if GCC_VERSION >= 40300
> -# define __compiletime_error(message) __attribute__((error(message)))
> -#endif /* GCC_VERSION >= 40300 */
> +#define __compiletime_error(message) __attribute__((error(message)))
>  
>  /* &a[0] degrades to a pointer: a different type from an array */
>  #define __must_be_array(a)	BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))

This part could be applied regardless (it's a missed 4.3 check, yes?)

-- 
Kees Cook